December 2001 meeting of SC-03-01

[Last printing 26 April 2002]
Report of the SC-03-01 Working Group on Analog Recording
of the SC-03 Subcommittee on Subcommittee on the Preservation and Restoration
of Audio Recording
meeting, held in
conjunction with the AES 111th Convention in New York City, NY,
US,
2001-12-01.

Chair J. McKnight
convened the meeting. The agenda were approved but the
report from the previous meeting at the AES 109th Convention not available.
The
report of the meeting at the 108th convention was
approved as modified to change "two-signal mode" to "two-sigma mode."

The chair reported problems with the incorporation of the amendment to IEC
60386 into the document. He has not been able to obtain enough of the
background material thus far and asked to extend the goal to 2002-05.

He said new measurements of psychophysical factors in flutter perception
are
needed in order to update the standard. He will approach the Technical
Committee on Perception of Audio for help. The concern is mainly for
scrape
flutter, including frequency modulation noise from 100 Hz upward.

D. Schueller reported difficulties using the DIN standard, as well as the
similar IEC and AES standards, particularly when
trying to evaluate scrape flutter. But because the newer generations of
tape
playing equipment largely eliminated this problem, the deficiency was not
corrected. However, now, because of the needs of archivists, such a
measurement
has again become desireable. He related experiences show low scrape
flutter
when replaying old tapes with
special machines having only playback heads and special guides.

McKnight pointed out that many experiences have been with machines having
many
variables so that the effects of high-frequency flutter could not be
separated
from other effects. He said research is needed in order to define the
measurement better.

AES7-R Review of AES7-2000 AES standard for the preservation and
restoration of
audio recording -- Method of measuring recorded fluxivity of
magnetic sound records at medium wavelengths

No action was taken

New projects

No project requests were received or introduced.

New Business

There was no new business

The next meeting is scheduled to be held in conjunction with the
AES 112th Convention in Munich, Germany.